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White smoke after coolant pressure test
I have the same problem so many others have with my 2005 6.0 puking coolant ocassionally. I have searched for my specific issue but haven't found it on the forums so figured I would ask.
Every once in a while I get a little coolant puking from the degass bottle. Never gets very low on coolant, I usually add only about 1/3 to 1/2 gallon of Zerex G05 when I notce it is low which has been 3 times over 6 months. I have replaced the degass bottle cap with a FOMOCO and it still did it the other day, not pulling anything, just town driving.
A mechanic told me to get a coolant pressure test kit so I borrowed one and tested the cap first and it held to 16Psi. I then pressurized the system at the degass bottle to around 16-17 Psi, jacked up the rear end about 8" and removed the EGR valve. I let it is for 2.5 hours. I never saw any coolant at the EGR valve port like I expected and I never lost pressure on the tester; it was still at 16-17. The next morning when I started it, it started rough and blew white smoke out. This is not normal, I have never seen it blow white smoke out before. It smoked for only a few seconds and I have started and drove it a few times since and it never smoked again.
Anyone know why it would smoke like that?
Also, I just bought an Edge programmer to monitor the ECT and EOT. I drove it about 15 miles and the warmest it ever got was ECT 203 deg and EOT 208. They were almost always within 2-4 deg apart while driving for about 1/2 hour.
Thanks for any advice.